76250, or 93/100. Native English speaker from London. Some of the last 10 words were seriously obscure.
Are accoutrement and ziggurat really English words? Accoutrement is even pronounced as French!
Weirdly enough, these words would be known to some non-native speakers as they show up every now and then in video games.
I did 78000 and I'm not a native English speaker.
Depending on what you consider an "English" word, anywhere from 0% to 100% of words are English words. I've definitely seen accoutrement and ziggurat in English, and quite often.
Those are both on the list of words I thought should have been in a category or two lower because I consider them both sufficiently widely used.